SpeeCo 20 ton splitter fluid question

Speeco says it's alright to use transmission fluid during the winter, I have a 55 gallon drum of it, is there any reason I cant/shouldn't use it now?

 

No problem .

From the manual
The hydraulic reservoir must be filled with the oil provided. AW 46 hydraulic oil is recommended when oil is needed. Automatic transmisssion fluid can be substituted and should be used instead of hydraulic oil when temperatures are below 32 degrees F. Use only clean oil and take care to prevent dirt from entering the hydraulic reservoir. Fill the hydraulic tank with approximately 3.5 to 4 gallons of hydraulic oil.

 

I picked up a Baldwin filter and a gallon of fluid, this sample of oil is from the old filter.